Does anyone know how to remove and install roof trim on W124?

Does anyone sell manual for that?

The rear end of left roof trim was loose and the rubber and the trim did not match. So I thought rust could develop there.

Last fall, I had an MB dealer tighten the roof trim.
They installed new roof trim.
Amazingly, they did not match the rubber at the rear end.
The trim was tight because they used new clips, but there was still concern of rust.
The service manager himself just pulleed the rubber with a plier (I guess he scratched the paint.).

Now the paint condition is bad around the rear end of the trim.

I have receipt, but I do not feel like having that dealer doing the job again.

I want to do it myself.
I was amzed at the poor quality job at the expensive dealer.
They got JD Power award.